Thread: Rear end width questions -

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JW, welcome to the forum. On your questions:

1 & 2. 79-93 Mustangs use a 57 inch wide rear axle. 94-98 Mustangs use a 58.5 inch wide rear axle. I don't know of anything OEM (in recent years) that's exactly 58", and those older units are getting harder & harder to find after the rust bucket tax program cleared out a lot of good old stuff.
3 & 4. From what I've seen on the Mustang posts, Ford had Equa-lock and Traction-lok but I haven't ever seen a tru loc mentioned. I believe that all of the OEM traction assist axles, unless you get into true lockers in their 4x4 applications, are a clutch pack carrier we all knew as "posi traction" back in the day. What I used is a Detroit Eaton Trutrac Performance Products | Detroit Truetrac Differentials which is a spiral gear unit that is all but bullet proof in normal operation, locks solid under power, but allows slip side to side for good manners on the street, and no additives required. A really sweet unit.
Hope that helps. (Looks like prpmmp had a more comprehensive list, and was quicker!!)